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Accurate calibration of 85070E

Question asked by andyjessop on Jul 25, 2007
Latest reply on Nov 17, 2010 by DoctorT
I have had some problems obtaining repeatable measurements with the 85070E Dielectric Probe Kit. For example, I have calibrated using the air, short, water method then measured the dielectric properties of the water. The measurement produced a value of e' of approx. 101 and e'' of 15. This calibration was then repeated using exactly the same methods straight after the previous measurement and the values obtained were approx. 78 and 14. I did not touch the probe between calibration and measurement and cannot see how the measurements could be so different. Could you give me an idea of the practices that I should undertake to minimise this error. Are there any common mistakes that I could be making? Thanks for your time.